Find out more about Harley Stage 1 upgrades and tuning. Arlen Ness Stage 1 Smooth Big Sucker Air Cleaner Kit For Harley Sportster. Arlen Ness, the "King of Choppers", knows a thing or two about performance. Arlen Ness Naked Stage 1 Big Sucker Air Filter For Harley Sportster. Arlen Ness, the "King of Choppers", knows a thing or two about performance. The Big.